package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/*检查用户是否已经完成登录*/
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
//  路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


//        1. 获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login",    //移动端登录
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
//        2. 判断本次请求, 是否需要登录, 才可以访问
        boolean check = check(urls,requestURI);

//        3. 如果不需要，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request, response);
            return;
        }

//        4-1. 判断pc端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
//            long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);

            filterChain.doFilter(request, response);
            return;
        }

//        4-2. 判断移动端登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
//            long id = Thread.currentThread().getId();
//            log.info("线程id为：{}",id);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("用户未登录");
//        5. 如果未登录, 则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /*路径匹配，检查本次请求是否需要放行*/
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url,requestURI);
            if (match) return true;
        }
        return false;
    }

}
